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The procedure is qualitative and encourages careful observation. Various factors are investigated by changing each separately, with all others constant. Discussion of how or why each variable affects the reaction rate is left to the instructor.
If the activity is performed early in the school year, it might be revisited later when kinetics is introduced and those questions addressed at that time. All materials are common household items. The activity can be safely done at home or in the chemistry lab at school.
About the Activity The activity steps can be done independently and in any order, but as written they progress from simpler to more complex procedures. Students should work in pairs or small groups because some procedures need to be done simultaneously. Tap water can be used with this activity. All waste can be disposed of down the drain.
The acid and base in the dry tablet do not react or react so slowly that evolution of gas is not observed. When the tablet is added to water the acid and base both dissolve.
The reaction to produce CO2 bubbles begins at once and proceeds rapidly.
The dry tablet half will not react unless water is added. The greater the surface area of the solid the more rapidly the reaction occurs—the powder reacts faster than the whole tablet. The rate of reaction is faster at higher temperatures. No reaction is observed when water is added to baking soda. The solid dissolves in water, but no CO2 bubbles form. Baking soda dissolves and reacts with the acetic acid in vinegar to produce CO2 bubbles.
Using an acetic acid solution more concentrated than vinegar is a reasonable experiment, but the reaction with vinegar is so rapid that students are unlikely to be able to notice a difference using a more concentrated solution.
Students must be carefully supervised and must observe the necessary safety precautions if they are allowed to attempt such a procedure. Switching to an acid other than acetic acid would introduce a variable other than concentration.
State of matter: substances in solution react faster than solids. Temperature: reactions occur faster at higher temperature. Surface area: the greater the surface area, the faster the reaction. Concentration: a more concentrated solution reacts faster. Increase rate: Increase the temperature, grind or dissolve solid reactants, increase concentrations of reacting solutions.
Decrease rate: Lower the temperature, use bigger pieces of solid reactants, lower concentration of solutions. Baking soda is sodium bicarbonate. Baking powder is sodium bicarbonate mixed with a dry acid or acidic salt.
Both react to produce bubbles of carbon dioxide in dough or batter, causing it to rise. For baking soda to react, an acid must be present examples: buttermilk, lemon juice. Likewise, margarine doesn't always work well in place of butter and yes, eggs are important.
While it's difficult to determine exactly how many people are involved in cooking as a hobby, it's pretty safe to say that the number is large. Just look at all the shops and magazines that cater to cooks! The James Beard Foundation has about 4, members.
There is also a large number of professional cooks. While cooking has always been necessary for survival, more people are getting involved in cooking for fun. Many people who have traditionally stayed away from the kitchen are picking up some pots and pans.
A flair for cooking can lead to a career in the kitchen, as a cook or chef, sous chef or pastry chef. Others have gone into careers in catering. For those who want to go pro, Gardiner has this advice: "Cook as much as you can until basic methods and techniques become second nature. I read the synopsis on the rear cover, so I wasn't expecting a scientific Culinary thesis.
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